US1693328A - Automatic reclosing-circuit-breaker system - Google Patents

Automatic reclosing-circuit-breaker system Download PDF

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Publication number
US1693328A
US1693328A US117309A US11730926A US1693328A US 1693328 A US1693328 A US 1693328A US 117309 A US117309 A US 117309A US 11730926 A US11730926 A US 11730926A US 1693328 A US1693328 A US 1693328A
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US
United States
Prior art keywords
circuit
relay
circuit breaker
load
contacts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US117309A
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English (en)
Inventor
Arvid E Anderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US117309A priority Critical patent/US1693328A/en
Priority to DEA51265D priority patent/DE478667C/de
Application granted granted Critical
Publication of US1693328A publication Critical patent/US1693328A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection

Definitions

  • My invention relates to automatic reclosing circuit breaker systems, and particularly tosuch systems in which the reclosing of a circuit breaker which is arranged to connect a supply circuit to a load circuit is controlled by the load connected to the load circuit.
  • One object of my invention is to provide an improved system for-effecting the reclosing of a circuit breaker in response to a predetermined value of load resistance only when there is a useful or normal load connected to the load conductors, and will not effect the closing of the circuit breaker in response to the'same value of load resistance if there is short circuit connected across the. load circuit.
  • 1 and 2 represent conductors 0 two direct-current circuits which are arranged to be connected together by means of a circuit breaker 3 of any suitable type.
  • the conductors 1 and 2 may, for example, be sections of a railway circuit, the conductor 1 being part of the supply circuit which is connected to a suitable-source of current 4, and the conductor 2 being part of the load circuit to which is connected a load 5.
  • the ground constitutes the other side of the two direct current circuits, but it is apparent that my invention is not limited to a grounded system.
  • the load circuit may also be supplied with current.
  • the circuit breaker 3 is of thewell known contactor type, the closing coil 6 of which is arranged to be de-energized in any suitable manner to effect the opening of the circuit breaker when an abnormal load condition occurs on either of the two circuits.
  • an overload relay 7 is provided, which is so connected and arranged that it opens its contacts 8 in I thecircuit of the closing coil 6 when the current through the main contacts of the circuit breaker exceeds a certain amount.
  • this means which discriminates between the two kinds of load is the reclosing relay 9 which is connected across the secondary winding 10 of a transformer 11, the primary winding 12 of which is arranged to be connected across the load circuit by means of the auxiliary contacts 13 on the circuit breaker when it is open. Since the relay 9 is inductively con-. 'nected across the direct current load circuit,
  • the energization of the relay 9 depends upon the magnitude and duration of the voltage change, and also the, rate at which the voltage change takes place.
  • the load contains very little reactance in proportion to its resistance, and the load-circuit is connected to a source of constant voltage through a relatively high constant resistance, the voltage change produced when the connection is made occurs at a very high rate and lasts for only a very short time, and the magnitudeof the chan increases directly with the resistance of t e load circuit.
  • The. greater the proportion of the reactance for a given value of resistance the lower the rate of change of the voltage, but the longer its duration.
  • a greater voltage change is produced and therefore a greater voltage is induced in the secondary winding 10 of the transformer.
  • the relay 9 is arranged in any suitable manner, so that it does not close its con tacts 15 until after its coils have been energized more than a certain amount for more than a certain length of time. Therefore, the voltage, which is induced in the secondary winding 10 of the transformer 11 by a given resistance load containing a relatively small amount of reactance, such as a short circuit, does not cause the relay 9 to close its contacts 15 because its duration is not long enough, but the voltage, which is induced by the same resistance load containing a relatively high amount of reactance, such as the normal useful load, is of suflicient durationto allow the relay 9'to close its contacts 15.
  • the relay 9 picks up and closes its contacts 15 in response to a value of load resistance above a predeter mined value when there is only a useful load, such as a. motor load, connected across the load circuit, and does not pick up in response to the same value of load resistance when there is an abnormal load containing relatively little reactance connected. across the load circuit.
  • I provide a time relay 16 which isarranged to be energized in response to the opening of the circuit breaker 3, and which completes a circuit for contactor 17 after the circuit breaker has been open for a certain length of time.
  • the contactor 17 is provided with auxiliary contacts 19, which are in the circuit of the closing coil of the time relay 16,- so that when the contactor 17 is closed, the time relay 16 is deenergized.
  • the time relay 16 is arranged in any suitable manner, examples of which are well known in the art, whereby it does not close its contacts 20 until after its coil has been energized for a certain length of time, and does' not open its contacts until after the coil has been deenergized for a certain length of time.
  • the time delay of the relay, in opening its contacts, is relatively short, being only long enough to permit the reclosing relay to effect the reclosing of the circuit breaker, whereas the time delay of the relay, in closing its I contacts, is relatively long. It will be observed, therefore, that so long as the circuit breaker 1.remains open, the contactor 17 is periodically opened and closed by the operation of the relay 16 and the contactor 17.
  • a control relay 22 which is arranged to be energized when both the time relay contacts 20' and the reclosingrelay contacts 15. are closed.
  • the control relay 22 when energized, completes an energizing circuit for the closin coil of the circuit breaker 6.
  • the relay 9 Since the relay 9 isenergized only while the voltage across the load circuit is changing, it is necessary to provide suitable means to maintain the contacts 15 of the relay closed until after the circuit breaker has been reclosed. I accom lish this result by means of a latch 24 which holds the relay contacts 15 closed after they have been closed, and a release coil 25,- which is arranged to be energized to'release the latch when the circuit breaker 3 is reclosed.
  • a resistor 27 may be provided in the secondary circuit ofthe transformer if necessary. Also in order to insure that the relay 9 does not close its contacts 15 after relay 26 has opened its contacts 34 and before the contactor 17 has closed, the circuit of the coil 9 includes the auxiliary contacts 35 on the contactor 17 which are arranged to be closed before its main contacts are closed.
  • control relay 22 is not energized to'efi'ect the reclosing of the circuit breaker.
  • the openingof the auxiliary contacts 19 of the contactor 17 effects the deenergizaits contacts 20 o ens the circuit of the coil of tion of the coils of the time relays 16 and 26, these relays. a short time after their coils are deenergized, are restored to their normal positions.
  • the relay 26 by closing its contacts 34 reestablishes the short circuit across the secondary of the transformer 11 so that the relay 9 cannot be operated by the voltagechange that is produced by the opening of the contactor 17 and the relay 16 by opening the contactor 17 so that the connection between the two conductors 1 and 2 is opened.
  • the arrangement is such that the rela 9 operates in response to a load resistance a ove a predetermined value if the load contains a relatively large amount of reactance, but does not operate in response to the same value of load resistance if the load contains a relatively small amount of reactance.
  • F urthermore,'since'the relay 9 has to close its contacts 15 before the'circuit breaker 3 can close the present arrangement has the advantage that the reclosing of the circuit breaker cannot be effected when the relay 9 is prevented frombeing energized by an open circuit in the control equipment.
  • the opening of the auxiliary contacts 13 on the circuit breaker when it closes, disconnects the primary of the transfo'rmer from the load circuit and 'opensthe circuit of the closing coil of the contactor 17.
  • the opening of the auxiliary contacts 30 prevents the time relays 16 and 26 from being reenergized when the contacts 19 of the contactor 17 are reclosed.
  • the closing of the auxiliary contacts 29 completes'the heretofore traced holding circuit for the closing coil 6', and the closing of the auxiliary contacts 33 completes a circuit for the release coil 25 of the reclosing relay 9, across the supply circuit, so that the reclosing relay 9 is restored toits normal po- 'sition.
  • timing means responsive to the rate at which thevoltage across said load circuit changes in response tothe operation-of said last mentioned means .for controlling the reclosing of said circuit breaker.
  • an automatic reclosing circuit breaker system two direct current circuits, a circuit breaker connecting said circuits together, means for effecting the opening of said circuit'breaker upon the occurrence of an abnormal condition on one of said circuits, current limiting means, means responsive to the opening of said circuit br aker for connecting said current limiting m ans 'n series between said circuits, a transformer, means controlledby the opening of said circuit breaker for connecting the primary winding of said transformer across the circuit on which the abnormal condition occurred, and a time re-- lay connected across the secondary winding of said transformer for controlling the reclosirig of said circuit breaker.
  • an automatic reclosing circuit breaker system a supply circiiit, a load circuit, a circuit breaker connecting said circuits together, means for opening said circuit breaker, means for periodically producing changes in the voltage impressed on said load circuit when the circuit breaker is open, and timing means controlled by the voltage change produced across said load circuit by the operation of said last mentioned means for controlling the reclosing of said circuit breaker.
  • a supply circuit a load circuit, a circuit breaker connecting said circuits together, means for opening said circuit breaker, means for periodically producing changes in the voltages impressed on said load circuit when the circuit breaker is open, means for effecting the reclosin transformer having its primary winding connected acrosssaid load circuit when said circuit breakeris open, and a relay connected across the secondary winding of said transformer and arranged to control said voltage changing means and said reclosing means.
  • an automatic reclosing circuit breaker system two direct current circuits, a circuit breaker connecting said circuits together, overload responsive means for efiecting the opening of said circuit breaker u on. the occurrence of a predetermined over oad condition'on one of said circuits, means for producing a voltage change across the circuit on which the abnormal condition occurred, a transformer arranged to have its primary winding connected across said one of said circuits when the circuit breaker is open, a relay connected across the secondary winding of said transformer and arranged to control .ah reclosing of said circuit breaker, and means for rendering said reclosing relay inoperativefor a certain length of time after the circuit breaker opens.
  • two direct current circuits a circuit breaker connecting said circuits together, overload responsive means for effecting the opening of said circuit breaker upon the occurrence of a predetermined overload condition on one of said circuits means for producing a voltage change across the circuit on .which the abnormal condition occurred, a transformer arranged to have its primary winding connected across said one of said circuits when the circuit breaker .is open, a
  • relay connected :across the secondary winding of said transformer and arrange to control the reclosing of said circuit breaker, and means for rendering said relay inoperative during the opening of said circuit breaker overload responsive means for effecting the opening of sald c1rcu1t breaker, means responsive. to the openmg of said c1rcu1t breaker for periodically connecting and disconnecting said circuits, a reclosing relay inductively 'connected across said load circuit-for effecting the reclosure of said circuit breaker, and

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  • Keying Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US117309A 1926-06-21 1926-06-21 Automatic reclosing-circuit-breaker system Expired - Lifetime US1693328A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US117309A US1693328A (en) 1926-06-21 1926-06-21 Automatic reclosing-circuit-breaker system
DEA51265D DE478667C (de) 1926-06-21 1927-06-22 Selbsttaetige Wiedereinschaltvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US117309A US1693328A (en) 1926-06-21 1926-06-21 Automatic reclosing-circuit-breaker system

Publications (1)

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US1693328A true US1693328A (en) 1928-11-27

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US117309A Expired - Lifetime US1693328A (en) 1926-06-21 1926-06-21 Automatic reclosing-circuit-breaker system

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US (1) US1693328A (de)
DE (1) DE478667C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620382A (en) * 1951-02-02 1952-12-02 Mcgraw Electric Co Automatic reclosing circuit breaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE964874C (de) * 1953-08-30 1957-05-29 Siemens Ag Streckenpruefeinrichtung fuer Wechselstrombahnen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620382A (en) * 1951-02-02 1952-12-02 Mcgraw Electric Co Automatic reclosing circuit breaker

Also Published As

Publication number Publication date
DE478667C (de) 1929-07-05

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